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Method for preventing elemental sulfur from adhering to surface of electrode in electrocatalytic reduction process of sulfur dioxide

A technology of sulfur dioxide and electrode surface, applied in electrolysis process, electrodes, electrolysis components, etc., can solve the problems of low catalytic efficiency, reduce energy consumption, adhesion, etc., achieve high reaction efficiency, solve environmental pollution problems, and low energy consumption.

Active Publication Date: 2020-09-15
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the defects of the existing electrocatalytic conversion of sulfur dioxide into elemental sulfur, such as low catalytic efficiency and the adhesion of elemental sulfur on the surface of the electrode to poison the electrode, the purpose of the present invention is to provide a high electrocatalytic reduction efficiency for sulfur dioxide, and A method that can effectively prevent the elemental sulfur generated by reduction from adhering to poison the electroreduction catalyst, and the method can be implemented at normal temperature and pressure, is simple to operate, can greatly reduce energy consumption, and is conducive to popularization and application

Method used

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  • Method for preventing elemental sulfur from adhering to surface of electrode in electrocatalytic reduction process of sulfur dioxide
  • Method for preventing elemental sulfur from adhering to surface of electrode in electrocatalytic reduction process of sulfur dioxide
  • Method for preventing elemental sulfur from adhering to surface of electrode in electrocatalytic reduction process of sulfur dioxide

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Effect test

Embodiment 1

[0031] Analytical pure sodium sulfite, without surfactants.

[0032] Mix 50mL of water and sodium sulfite (0.08mol / L) in a certain ratio evenly and take it into the cathode chamber as catholyte, 50mL of anhydrous sodium sulfate aqueous solution as anolyte, lead sheet as working electrode, and Pt as counter electrode. electrode, and SCE as a reference electrode. Perform electrochemical performance tests. Select -0.8V electrolysis potential in the process, control the same electrolysis power (400C), sulfite concentration is 0.08mol / L, use sulfuric acid to adjust the pH of the cathode and anode electrolysis chamber to 0.5, stir at 1000rmp, test the current density-time curve (i-t curve). The slope of the i-t curve is 0.09.

Embodiment 2

[0034] Mix 50mL of water, sodium sulfite (0.08mol / L) and 5% isopropanol solution (0.01mol / L) in a certain ratio evenly and take it into the cathode chamber as catholyte, and 50mL of anhydrous sodium sulfate solution as anode Electrolyte, lead sheet as working electrode, Pt as counter electrode, SCE as reference electrode for electrochemical performance test. Select -0.8V electrolysis potential in the process, control the same electrolysis power (400C), sulfite concentration is 0.08mol / L, use sulfuric acid to adjust the pH of the cathode and anode electrolysis chamber to 0.5, stir at 1000rmp, test the current density-time curve (i-t curve). The i-t curve slope can be reduced from 0.09 to 0.06.

Embodiment 3

[0036] Mix 50mL of water, sodium sulfite (0.08mol / L), and 0.3g / L polyvinylpyrrolidone (PVP) in a certain proportion and take them into the cathode chamber as catholyte, and 50mL of anhydrous sodium sulfate as anolyte , the lead sheet was used as the working electrode, Pt was used as the counter electrode, and SCE was used as the reference electrode for electrochemical performance testing. Select -0.8V electrolysis potential in the process, control the same electrolysis power (400C), sulfite concentration is 0.08mol / L, use sulfuric acid to adjust the pH of the cathode and anode electrolysis chamber to 0.5, stir at 1000rmp, test the current density-time curve (i-t curve). The i-t curve slope can be reduced from 0.09 to 0.05.

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Abstract

The invention discloses a method for preventing elemental sulfur from adhering to the surface of an electrode in the electrocatalytic reduction process of sulfur dioxide. A three-electrode system is adopted in the electrocatalytic reduction process; a cathode chamber and an anode chamber of the three-electrode system are separated by a proton membrane; the electrolyte in the cathode chamber is sulfur dioxide absorption liquid added with a surfactant; an electrolyte in the anode chamber is a Na2SO4 / H2SO4 mixed solution; metal electrodes such as lead are used as working electrodes; Pt is used asa counter electrode, a saturated calomel electrode is used as a reference electrode, elemental sulfur particles are separated out from an electrolyte in a cathode chamber after electrocatalytic reduction, and the problem that elemental sulfur separated out in the sulfur dioxide electrocatalytic reduction process adheres to the surface of the electrode is solved mainly by adding the surfactant. According to the method, sulfur dioxide can be efficiently electrocatalytically reduced to generate elemental sulfur, poisoning of the elemental sulfur to the surface of the electrode can be effectivelyeradicated, the process is short, operation is easy, secondary pollution is avoided, and industrial application is facilitated.

Description

technical field [0001] The invention relates to a method for synthesizing elemental sulfur by electrocatalytic reduction of sulfur dioxide, in particular to a method for using a surfactant to prevent the adhesion of elemental sulfur generated in the process of electrocatalytic reduction of sulfur dioxide to the electrode surface, which belongs to the useful resource of non-ferrous smelting flue gas recovery technology field. Background technique [0002] Based on the concept of environmental protection and resource recycling, the current research on air pollution has gradually focused on how to utilize pollutants as resources. The resource utilization of sulfur dioxide polluted gas is mainly to prepare sulfuric acid by oxidation or sulfur by reduction. With the increasing demand for sulfur in my country, the technology of how to convert sulfur dioxide into elemental sulfur simply and effectively has received continuous attention and development. Electrocatalytic reduction ...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B11/04
CPCC25B1/00C25B11/04
Inventor 刘恢刘旭东沈锋华柴立元朱芳芳向开松谢小峰闵小波杨志辉李青竹王海鹰唐崇俭王庆伟
Owner CENT SOUTH UNIV
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